Believe it or not, Fight Milk wasn’t the first not-exactly-milky drink that Ronald “Mac” Donald ever endorsed.

Before Rob McElhenney came up with the idea of shooting a shoestring-budget pilot for a sitcom about the biggest a-holes in Pennsylvania, he was a struggling actor in L.A. waiting tables in between acting gigs. The slightly embarrassing before-they-were-famous careers of McElhenney’s co-stars are already an integral part of the It’s Always Sunny in Philadelphia lore — Glenn Howerton starred in the hated failure of a sitcom That ‘80s Show before becoming Dennis Reynolds, and Charlie Day passed on an almost-as-bad show to work as an illiterate janitor. But McElhenney’s list of credits pre-2005 is, comparatively, not quite as notable or mockable as those of his collaborators.

However, there is one particularly fascinating and thankfully surviving clip from McElhenney’s acting career pre-Sunny that even includes cameos from a couple of his future co-stars.